<template>
    <div id="root">
        <div class="todo-container">
            <div class="todo-wrap">
            <!-- 编写组件标签，头部组件 -->
            <MyHeader :addTodo="addTodo"></MyHeader>
            
            <!-- 内容列表组件 -->
            <MyList 
                :todos="todos" 
                :checkTodo="checkTodo"
                :todoDelete="todoDelete">
            </MyList>

            <!-- 下脚组件 -->
            <MyFooter 
                :todos="todos"
                :checkAllTodo="checkAllTodo"
                :clearAllTodo="clearAllTodo">
            </MyFooter>
            </div>
        </div>
    </div>
</template>

<script>
    //引入组件
    import MyHeader from './components/MyHeader.vue';
    import MyFooter from './components/MyFooter.vue';
    import MyList from './components/MyList.vue';

    export default {
        name:'App',
        components:{
            MyHeader,
            MyFooter,
            MyList
        },
        data() {
            return {
                todos:[
                    {id:"001",title:'吃饭',done:true},
                    {id:"002",title:'睡觉',done:false},
                    {id:"003",title:'学习',done:true},
                    {id:"004",title:'抽烟',done:false},
                    {id:"005",title:'喝酒',done:false},
                    {id:"006",title:'开车',done:true}
                ]
            }
        },
        methods:{
            // 添加一个todo
            addTodo(todoObj){
                console.log("我是组件App，我收到数据:",todoObj);
                //this.todos.push(x);//将数据加入数组中
                this.todos.unshift(todoObj);//将数据加入数组中
            },
            //勾选or取消一个todo
            checkTodo(id){
                // for (let index = 0; index < this.todos.length; index++) {
                //     if(this.todos[index].id===id){
                //         this.todos[index].done=!this.todos[index].done;
                //     }
                // }
                //使用forEach，注意：当foreach无法使用的使用可能是脚手架没有安装对应的js版本，需要运行：npm install core-js@3.6.4名
                this.todos.forEach((todo)=>{
                    if (todo.id===id) {
                        todo.done=!todo.done;
                    }
                });
            },
            //删除一个todo
            todoDelete(id){
                //使用过滤器删除，需要运行npm install core-js@3.6.4命令才能使用filter过滤器
                this.todos=this.todos.filter((todo)=>{
                    return todo.id!==id;
                });

                //传统的过滤删除方法
                // for (let index = 0; index < this.todos.length; index++) {
                //     if(this.todos[index].id===id){
                //         this.todos.pop(index);
                //     }
                // }
            },

            //全选or取消全选
            checkAllTodo(done){
                this.todos.forEach((todo)=>{
                    todo.done=done;
                });
            },

            //清除所有已经完成的todo
            clearAllTodo(){
                this.todos=this.todos.filter((todo)=>{
                    return !todo.done;
                });
            }
        }
    }
</script>

<style>
    /*base*/
    body {
        background: #fff;
    }

    .btn {
        display: inline-block;
        padding: 4px 12px;
        margin-bottom: 0;
        font-size: 14px;
        line-height: 20px;
        text-align: center;
        vertical-align: middle;
        cursor: pointer;
        box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
        border-radius: 4px;
    }

    .btn-danger {
        color: #fff;
        background-color: #da4f49;
        border: 1px solid #bd362f;
    }

    .btn-danger:hover {
        color: #fff;
        background-color: #bd362f;
    }

    .btn:focus {
        outline: none;
    }

    .todo-container {
        width: 600px;
        margin: 0 auto;
    }

    .todo-container .todo-wrap {
        padding: 10px;
        border: 1px solid #ddd;
        border-radius: 5px;
    }
</style>